Export ASP.Net GridView to Excel on Button Click using C# and VB.Net

Hi vrindavani,

Check this example. Now please take its reference and correct your code.

Database

I have made use of the following table Customers with the schema as follows.

I have already inserted few records in the table.

You can download the database table SQL by clicking the download link below.

Download SQL file

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="ID" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
    </Columns>
</asp:GridView>
<asp:ImageButton AlternateText="Export" runat="server" OnClick="Excel_Click" />

Namespaces

C#

using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.IO;

VB.Net

Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.IO

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        this.ReadData();
    }
}

private void ReadData()
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    string query = "SELECT * FROM Customers";
    SqlCommand cmd = new SqlCommand(query);
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (DataTable dt = new DataTable())
            {
                sda.Fill(dt);
                GridView1.DataSource = dt;
                GridView1.DataBind();
            }
        }
    }
}

protected void Excel_Click(object sender, ImageClickEventArgs e)
{
    Response.ClearContent();
    Response.AddHeader("content-disposition", "attachment;filename=Customers.xls");
    Response.ContentType = "application/vnd.ms-excel";
    StringWriter sw = new StringWriter(); ;
    HtmlTextWriter htm = new HtmlTextWriter(sw);
    GridView1.AllowPaging = false;
    this.ReadData();
    GridView1.RenderControl(htm);
    Response.Write(sw.ToString());
    Response.End();
}

public override void VerifyRenderingInServerForm(Control control)
{
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Page.IsPostBack Then
        Me.ReadData()
    End If
End Sub

Private Sub ReadData()
    Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim query As String = "SELECT * FROM Customers"
    Dim cmd As SqlCommand = New SqlCommand(query)
    Using con As SqlConnection = New SqlConnection(conString)
        Using sda As SqlDataAdapter = New SqlDataAdapter()
            cmd.Connection = con
            sda.SelectCommand = cmd
            Using dt As DataTable = New DataTable()
                sda.Fill(dt)
                GridView1.DataSource = dt
                GridView1.DataBind()
            End Using
        End Using
    End Using
End Sub

Protected Sub Excel_Click(ByVal sender As Object, ByVal e As ImageClickEventArgs)
    Response.ClearContent()
    Response.AddHeader("content-disposition", "attachment;filename=Customers.xls")
    Response.ContentType = "application/vnd.ms-excel"
    Dim sw As StringWriter = New StringWriter()
    Dim htm As HtmlTextWriter = New HtmlTextWriter(sw)
    GridView1.AllowPaging = False
    Me.ReadData()
    GridView1.RenderControl(htm)
    Response.Write(sw.ToString())
    Response.End()
End Sub

Public Overrides Sub VerifyRenderingInServerForm(ByVal control As Control)
End Sub

Screenshots

Form

Exported Excel